<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>v-bind指令</title>
    <style>
        .active {
            border: 5px solid red;
        }
    </style>
</head>

<body>
    <div id="app">
        <img v-bind:src="imgSrc" alt="">
        <br>
        <img :src="imgSrc" alt="" :title="imgTitle + '!!!'" :class="isActive ? 'active' : ''" @click="toggleActive">
        <img :src="imgSrc" alt="" :title="imgTitle + '!!!'" :class="{active:isActive}" @click="toggleActive">
    </div>
    <!-- 开发环境版本，包含了有帮助的命令行警告 -->
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el: "#app",
            data: {
                imgSrc: "https://upload-images.jianshu.io/upload_images/3298299-4af3e24824e33818.jpg",
                imgTitle: "平头哥",
                isActive: false
            },
            methods: {
                toggleActive: function () {
                    this.isActive = !this.isActive
                }
            }
        })
    </script>
</body>

</html>